1 files changed, 322 insertions, 0 deletions
diff --git a/sound/soc/fsl/imx-pcm-fiq.c b/sound/soc/fsl/imx-pcm-fiq.c
new file mode 100644
index 000000000..0d1240026
--- /dev/null
+++ b/sound/soc/fsl/imx-pcm-fiq.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0+
+// imx-pcm-fiq.c  --  ALSA Soc Audio Layer
+//
+// Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+//
+// This code is based on code copyrighted by Freescale,
+// Liam Girdwood, Javier Martin and probably others.
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/fiq.h>
+
+#include <linux/platform_data/asoc-imx-ssi.h>
+
+#include "imx-ssi.h"
+#include "imx-pcm.h"
+
+struct imx_pcm_runtime_data {
+	unsigned int period;
+	int periods;
+	unsigned long offset;
+	struct hrtimer hrt;
+	int poll_time_ns;
+	struct snd_pcm_substream *substream;
+	atomic_t playing;
+	atomic_t capturing;
+};
+
+static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
+{
+	struct imx_pcm_runtime_data *iprtd =
+		container_of(hrt, struct imx_pcm_runtime_data, hrt);
+	struct snd_pcm_substream *substream = iprtd->substream;
+	struct pt_regs regs;
+
+	if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
+		return HRTIMER_NORESTART;
+
+	get_fiq_regs(&regs);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		iprtd->offset = regs.ARM_r8 & 0xffff;
+	else
+		iprtd->offset = regs.ARM_r9 & 0xffff;
+
+	snd_pcm_period_elapsed(substream);
+
+	hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
+
+	return HRTIMER_RESTART;
+}
+
+static struct fiq_handler fh = {
+	.name		= DRV_NAME,
+};
+
+static int snd_imx_pcm_hw_params(struct snd_soc_component *component,
+				 struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+	iprtd->periods = params_periods(params);
+	iprtd->period = params_period_bytes(params);
+	iprtd->offset = 0;
+	iprtd->poll_time_ns = 1000000000 / params_rate(params) *
+				params_period_size(params);
+
+	return 0;
+}
+
+static int snd_imx_pcm_prepare(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+	struct pt_regs regs;
+
+	get_fiq_regs(&regs);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
+	else
+		regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
+
+	set_fiq_regs(&regs);
+
+	return 0;
+}
+
+static int imx_pcm_fiq;
+
+static int snd_imx_pcm_trigger(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			atomic_set(&iprtd->playing, 1);
+		else
+			atomic_set(&iprtd->capturing, 1);
+		hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
+		      HRTIMER_MODE_REL);
+		enable_fiq(imx_pcm_fiq);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			atomic_set(&iprtd->playing, 0);
+		else
+			atomic_set(&iprtd->capturing, 0);
+		if (!atomic_read(&iprtd->playing) &&
+				!atomic_read(&iprtd->capturing))
+			disable_fiq(imx_pcm_fiq);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t
+snd_imx_pcm_pointer(struct snd_soc_component *component,
+		    struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+	return bytes_to_frames(substream->runtime, iprtd->offset);
+}
+
+static const struct snd_pcm_hardware snd_imx_hardware = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
+	.period_bytes_min = 128,
+	.period_bytes_max = 16 * 1024,
+	.periods_min = 4,
+	.periods_max = 255,
+	.fifo_size = 0,
+};
+
+static int snd_imx_open(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd;
+	int ret;
+
+	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
+	if (iprtd == NULL)
+		return -ENOMEM;
+	runtime->private_data = iprtd;
+
+	iprtd->substream = substream;
+
+	atomic_set(&iprtd->playing, 0);
+	atomic_set(&iprtd->capturing, 0);
+	hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	iprtd->hrt.function = snd_hrtimer_callback;
+
+	ret = snd_pcm_hw_constraint_integer(substream->runtime,
+			SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0) {
+		kfree(iprtd);
+		return ret;
+	}
+
+	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+	return 0;
+}
+
+static int snd_imx_close(struct snd_soc_component *component,
+			 struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+	hrtimer_cancel(&iprtd->hrt);
+
+	kfree(iprtd);
+
+	return 0;
+}
+
+static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
+					    pcm->card->dev,
+					    IMX_SSI_DMABUF_SIZE);
+}
+
+static int ssi_irq;
+
+static int snd_imx_pcm_new(struct snd_soc_component *component,
+			   struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_pcm *pcm = rtd->pcm;
+	struct snd_pcm_substream *substream;
+	int ret;
+
+	ret = imx_pcm_new(rtd);
+	if (ret)
+		return ret;
+
+	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+	if (substream) {
+		struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+		imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
+	}
+
+	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+	if (substream) {
+		struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+		imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
+	}
+
+	set_fiq_handler(&imx_ssi_fiq_start,
+		&imx_ssi_fiq_end - &imx_ssi_fiq_start);
+
+	return 0;
+}
+
+static void snd_imx_pcm_free(struct snd_soc_component *component,
+			     struct snd_pcm *pcm)
+{
+	mxc_set_irq_fiq(ssi_irq, 0);
+	release_fiq(&fh);
+}
+
+static const struct snd_soc_component_driver imx_soc_component_fiq = {
+	.open		= snd_imx_open,
+	.close		= snd_imx_close,
+	.hw_params	= snd_imx_pcm_hw_params,
+	.prepare	= snd_imx_pcm_prepare,
+	.trigger	= snd_imx_pcm_trigger,
+	.pointer	= snd_imx_pcm_pointer,
+	.pcm_construct	= snd_imx_pcm_new,
+	.pcm_destruct	= snd_imx_pcm_free,
+};
+
+int imx_pcm_fiq_init(struct platform_device *pdev,
+		struct imx_pcm_fiq_params *params)
+{
+	int ret;
+
+	ret = claim_fiq(&fh);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
+		return ret;
+	}
+
+	mxc_set_irq_fiq(params->irq, 1);
+	ssi_irq = params->irq;
+
+	imx_pcm_fiq = params->irq;
+
+	imx_ssi_fiq_base = (unsigned long)params->base;
+
+	params->dma_params_tx->maxburst = 4;
+	params->dma_params_rx->maxburst = 6;
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &imx_soc_component_fiq,
+					      NULL, 0);
+	if (ret)
+		goto failed_register;
+
+	return 0;
+
+failed_register:
+	mxc_set_irq_fiq(ssi_irq, 0);
+	release_fiq(&fh);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
+
+void imx_pcm_fiq_exit(struct platform_device *pdev)
+{
+}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
+
+MODULE_LICENSE("GPL");